PixelEngine: Delay token updates by events.

To still get a speedup, mark if already an event is queued.
If so, don't raise a new event.

Source/Core/VideoCommon/PixelEngine.cpp

@@ -4,9 +4,8 @@
 
 // http://www.nvidia.com/object/General_FAQ.html#t6 !!!!!
 
-#include <atomic>
+#include <mutex>
 
-#include "Common/Atomic.h"
 #include "Common/ChunkFile.h"
 #include "Common/CommonTypes.h"
 #include "Common/Logging/Log.h"
@@ -90,13 +89,18 @@ static UPEDstAlphaConfReg m_DstAlphaConf;
 static UPEAlphaModeConfReg m_AlphaModeConf;
 static UPEAlphaReadReg m_AlphaRead;
 static UPECtrlReg m_Control;
-static std::atomic<u16> s_Token;  // token value most recently encountered
+
+std::mutex s_token_finish_mutex;
+static u16 s_token;
+static u16 s_token_pending;
+static bool s_token_interrupt_pending;
+static bool s_finish_interrupt_pending;
+static bool s_event_raised;
 
 static bool s_signal_token_interrupt;
 static bool s_signal_finish_interrupt;
 
-static int et_SetTokenOnMainThread;
-static int et_SetFinishOnMainThread;
+static int et_SetTokenFinishOnMainThread;
 
 enum
 {
@@ -112,15 +116,19 @@ void DoState(PointerWrap& p)
   p.Do(m_AlphaModeConf);
   p.Do(m_AlphaRead);
   p.DoPOD(m_Control);
-  p.Do(s_Token);
+
+  p.Do(s_token);
+  p.Do(s_token_pending);
+  p.Do(s_token_interrupt_pending);
+  p.Do(s_finish_interrupt_pending);
+  p.Do(s_event_raised);
 
   p.Do(s_signal_token_interrupt);
   p.Do(s_signal_finish_interrupt);
 }
 
 static void UpdateInterrupts();
-static void SetToken_OnMainThread(u64 userdata, s64 cyclesLate);
-static void SetFinish_OnMainThread(u64 userdata, s64 cyclesLate);
+static void SetTokenFinish_OnMainThread(u64 userdata, s64 cyclesLate);
 
 void Init()
 {
@@ -130,13 +138,17 @@ void Init()
   m_DstAlphaConf.Hex = 0;
   m_AlphaModeConf.Hex = 0;
   m_AlphaRead.Hex = 0;
-  s_Token = 0;
+
+  s_token = 0;
+  s_token_pending = 0;
+  s_token_interrupt_pending = false;
+  s_finish_interrupt_pending = false;
+  s_event_raised = false;
 
   s_signal_token_interrupt = false;
   s_signal_finish_interrupt = false;
 
-  et_SetTokenOnMainThread = CoreTiming::RegisterEvent("SetToken", SetToken_OnMainThread);
-  et_SetFinishOnMainThread = CoreTiming::RegisterEvent("SetFinish", SetFinish_OnMainThread);
+  et_SetTokenFinishOnMainThread = CoreTiming::RegisterEvent("SetTokenFinish", SetTokenFinish_OnMainThread);
 }
 
 void RegisterMMIO(MMIO::Mapping* mmio, u32 base)
@@ -207,8 +219,7 @@ void RegisterMMIO(MMIO::Mapping* mmio, u32 base)
 
   // Token register, readonly.
   mmio->Register(base | PE_TOKEN_REG,
-
-                 MMIO::ComplexRead<u16>([](u32) { return s_Token.load(); }),
+                 MMIO::ComplexRead<u16>([](u32) { return s_token; }),
                  MMIO::InvalidWrite<u16>());
 
   // BBOX registers, readonly and need to update a flag.
@@ -233,46 +244,70 @@ static void UpdateInterrupts()
                                    s_signal_finish_interrupt && m_Control.PEFinishEnable);
 }
 
-static void SetToken_OnMainThread(u64 userdata, s64 cyclesLate)
+static void SetTokenFinish_OnMainThread(u64 userdata, s64 cyclesLate)
 {
+  std::unique_lock<std::mutex> lk(s_token_finish_mutex);
+  s_event_raised = false;
+
+  s_token = s_token_pending;
+
+  if (s_token_interrupt_pending)
+  {
+    s_token_interrupt_pending = false;
     s_signal_token_interrupt = true;
     UpdateInterrupts();
   }
 
-static void SetFinish_OnMainThread(u64 userdata, s64 cyclesLate)
+  if (s_finish_interrupt_pending)
   {
+    s_finish_interrupt_pending = false;
     s_signal_finish_interrupt = true;
     UpdateInterrupts();
-
+    lk.unlock();
     Core::FrameUpdateOnCPUThread();
   }
+}
+
+// Raise the event handler above on the CPU thread.
+// s_token_finish_mutex must be locked.
+// THIS IS EXECUTED FROM VIDEO THREAD
+static void RaiseEvent()
+{
+  if (s_event_raised)
+    return;
+
+  s_event_raised = true;
+  if (!SConfig::GetInstance().bCPUThread || Fifo::UseDeterministicGPUThread())
+    CoreTiming::ScheduleEvent(0, et_SetTokenFinishOnMainThread, 0);
+  else
+    CoreTiming::ScheduleEvent_Threadsafe(0, et_SetTokenFinishOnMainThread, 0);
+}
 
 // SetToken
 // THIS IS EXECUTED FROM VIDEO THREAD
-void SetToken(const u16 _token, const int _bSetTokenAcknowledge)
+void SetToken(const u16 token, const bool interrupt)
 {
-  INFO_LOG(PIXELENGINE, "VIDEO Backend raises INT_CAUSE_PE_TOKEN (btw, token: %04x)", _token);
-  s_Token.store(_token);
+  INFO_LOG(PIXELENGINE, "VIDEO Backend raises INT_CAUSE_PE_TOKEN (btw, token: %04x)", token);
 
-  if (_bSetTokenAcknowledge)  // set token INT
-  {
-    if (!SConfig::GetInstance().bCPUThread || Fifo::UseDeterministicGPUThread())
-      CoreTiming::ScheduleEvent(0, et_SetTokenOnMainThread, 0);
-    else
-      CoreTiming::ScheduleEvent_Threadsafe(0, et_SetTokenOnMainThread, 0);
-  }
+  std::lock_guard<std::mutex> lk(s_token_finish_mutex);
+
+  s_token_pending = token;
+  s_token_interrupt_pending |= interrupt;
+
+  RaiseEvent();
 }
 
 // SetFinish
 // THIS IS EXECUTED FROM VIDEO THREAD (BPStructs.cpp) when a new frame has been drawn
 void SetFinish()
 {
-  if (!SConfig::GetInstance().bCPUThread || Fifo::UseDeterministicGPUThread())
-    CoreTiming::ScheduleEvent(0, et_SetFinishOnMainThread, 0);
-  else
-    CoreTiming::ScheduleEvent_Threadsafe(0, et_SetFinishOnMainThread, 0);
-
   INFO_LOG(PIXELENGINE, "VIDEO Set Finish");
+
+  std::lock_guard<std::mutex> lk(s_token_finish_mutex);
+
+  s_finish_interrupt_pending |= true;
+
+  RaiseEvent();
 }
 
 UPEAlphaReadReg GetAlphaReadMode()

Source/Core/VideoCommon/PixelEngine.h

@@ -61,7 +61,7 @@ void DoState(PointerWrap& p);
 void RegisterMMIO(MMIO::Mapping* mmio, u32 base);
 
 // gfx backend support
-void SetToken(const u16 _token, const int _bSetTokenAcknowledge);
+void SetToken(const u16 token, const bool interrupt);
 void SetFinish();
 UPEAlphaReadReg GetAlphaReadMode();